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All rights reserved.\r\n// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.\r\n\r\nimport { HttpClient } from \"./HttpClient\";\r\nimport { MessageHeaders } from \"./IHubProtocol\";\r\nimport { ILogger, LogLevel } from \"./ILogger\";\r\nimport { ITransport, TransferFormat } from \"./ITransport\";\r\nimport { EventSourceConstructor } from \"./Polyfills\";\r\nimport { Arg, getDataDetail, getUserAgentHeader, Platform, sendMessage } from \"./Utils\";\r\n\r\n/** @private */\r\nexport class ServerSentEventsTransport implements ITransport {\r\n    private readonly httpClient: HttpClient;\r\n    private readonly accessTokenFactory: (() => string | Promise<string>) | undefined;\r\n    private readonly logger: ILogger;\r\n    private readonly logMessageContent: boolean;\r\n    private readonly withCredentials: boolean;\r\n    private readonly eventSourceConstructor: EventSourceConstructor;\r\n    private eventSource?: EventSource;\r\n    private url?: string;\r\n    private headers: MessageHeaders;\r\n\r\n    public onreceive: ((data: string | ArrayBuffer) => void) | null;\r\n    public onclose: ((error?: Error) => void) | null;\r\n\r\n    constructor(httpClient: HttpClient, accessTokenFactory: (() => string | Promise<string>) | undefined, logger: ILogger,\r\n                logMessageContent: boolean, eventSourceConstructor: EventSourceConstructor, withCredentials: boolean, headers: MessageHeaders) {\r\n        this.httpClient = httpClient;\r\n        this.accessTokenFactory = accessTokenFactory;\r\n        this.logger = logger;\r\n        this.logMessageContent = logMessageContent;\r\n        this.withCredentials = withCredentials;\r\n        this.eventSourceConstructor = eventSourceConstructor;\r\n        this.headers = headers;\r\n\r\n        this.onreceive = null;\r\n        this.onclose = null;\r\n    }\r\n\r\n    public async connect(url: string, transferFormat: TransferFormat): Promise<void> {\r\n        Arg.isRequired(url, \"url\");\r\n        Arg.isRequired(transferFormat, \"transferFormat\");\r\n        Arg.isIn(transferFormat, TransferFormat, \"transferFormat\");\r\n\r\n        this.logger.log(LogLevel.Trace, \"(SSE transport) Connecting.\");\r\n\r\n        // set url before accessTokenFactory because this.url is only for send and we set the auth header instead of the query string for send\r\n        this.url = url;\r\n\r\n        if (this.accessTokenFactory) {\r\n            const token = await this.accessTokenFactory();\r\n            if (token) {\r\n                url += (url.indexOf(\"?\") < 0 ? \"?\" : \"&\") + `access_token=${encodeURIComponent(token)}`;\r\n            }\r\n        }\r\n\r\n        return new Promise<void>((resolve, reject) => {\r\n            let opened = false;\r\n            if (transferFormat !== TransferFormat.Text) {\r\n                reject(new Error(\"The Server-Sent Events transport only supports the 'Text' transfer format\"));\r\n                return;\r\n            }\r\n\r\n            let eventSource: EventSource;\r\n            if (Platform.isBrowser || Platform.isWebWorker) {\r\n                eventSource = new this.eventSourceConstructor(url, { withCredentials: this.withCredentials });\r\n            } else {\r\n                // Non-browser passes cookies via the dictionary\r\n                const cookies = this.httpClient.getCookieString(url);\r\n                const headers: MessageHeaders = {};\r\n                headers.Cookie = cookies;\r\n                const [name, value] = getUserAgentHeader();\r\n                headers[name] = value;\r\n\r\n                eventSource = new this.eventSourceConstructor(url, { withCredentials: this.withCredentials, headers: { ...headers, ...this.headers} } as EventSourceInit);\r\n            }\r\n\r\n            try {\r\n                eventSource.onmessage = (e: MessageEvent) => {\r\n                    if (this.onreceive) {\r\n                        try {\r\n                            this.logger.log(LogLevel.Trace, `(SSE transport) data received. ${getDataDetail(e.data, this.logMessageContent)}.`);\r\n                            this.onreceive(e.data);\r\n                        } catch (error) {\r\n                            this.close(error);\r\n                            return;\r\n                        }\r\n                    }\r\n                };\r\n\r\n                eventSource.onerror = (e: MessageEvent) => {\r\n                    const error = new Error(e.data || \"Error occurred\");\r\n                    if (opened) {\r\n                        this.close(error);\r\n                    } else {\r\n                        reject(error);\r\n                    }\r\n                };\r\n\r\n                eventSource.onopen = () => {\r\n                    this.logger.log(LogLevel.Information, `SSE connected to ${this.url}`);\r\n                    this.eventSource = eventSource;\r\n                    opened = true;\r\n                    resolve();\r\n                };\r\n            } catch (e) {\r\n                reject(e);\r\n                return;\r\n            }\r\n        });\r\n    }\r\n\r\n    public async send(data: any): Promise<void> {\r\n        if (!this.eventSource) {\r\n            return Promise.reject(new Error(\"Cannot send until the transport is connected\"));\r\n        }\r\n        return sendMessage(this.logger, \"SSE\", this.httpClient, this.url!, this.accessTokenFactory, data, this.logMessageContent, this.withCredentials, this.headers);\r\n    }\r\n\r\n    public stop(): Promise<void> {\r\n        this.close();\r\n        return Promise.resolve();\r\n    }\r\n\r\n    private close(e?: Error) {\r\n        if (this.eventSource) {\r\n            this.eventSource.close();\r\n            this.eventSource = undefined;\r\n\r\n            if (this.onclose) {\r\n                this.onclose(e);\r\n            }\r\n        }\r\n    }\r\n}\r\n"]}